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Table 7.1.7.2.2-1: One-layer to two-layer TBS translation table
RNTI stands for Radio Network Temporary Identifier. Below table lists down various RNTIs. Ref: [36.321:7.1].
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RNTI
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Value (hex)
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Purpose
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How do we get RNTI ?
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RA-RNTI
Random Access
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0001-003C
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RAR
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MAC calculates it while waiting for RAR
Ref: [36.321:5.1.4]
| RA-RNTI = 1 + t_id + 10 . f_id |
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Temporary C-RNTI
Cell
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0001-FFF3
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UL msg3 transmission after receiving RAR
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Received in RAR (MAC) message
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C-RNTI
Cell
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0001-FFF3
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UL/DL allocations
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Successful contention resolution during reception of L3 message, sent as a response to msg3, makes C-RNTI = Temporary C-RNTI
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TPC-PUCCH-RNTI
TPC-PUSCH-RNTI
Transmit Power
Control
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0001-FFF3
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PHY UL power control
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Configured by RRC (during reconfiguration procedure)
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P-RNTI
Paging
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FFFE
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Paging, SI change notification
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Constant specified in MAC standard [36.321:7.1]
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SI-RNTI
System Information
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FFFF
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System information messages
(including SIB1)
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Constant specified in MAC standard [36.321:7.1]
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t
t
Rather than going through parameters of various DCI formats, we would look at DCI formats from allocation mechanism point of view. We would also try to map the allocation requirements that we listed earlier (on page 9) to DCI formats.
Earlier we said there are three ways to indicate resource allocation. The type is specified with 1 bit resource allocation header field ('0' for Type 0 and Type 1 otherwise). As there are three types, to specify it in DCI, we would need three bits, but when resource assignment is done for type 2, resource allocation header field is not included. This way 1 bit field is sufficient to indicate resource allocation type. This also imply that the DCI format can support either resource allocation type 0/1 or type 2.
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